ASTM A335 P22 Studded Fin Tube 13Cr (SS410) Pins For Furnaces and Heaters
ASTM A335 P22 Studded Fin Tube 13Cr (SS410) Pins For Furnaces and Heaters
ASTM A335 P22 Studded Fin Tube with 13Cr (SS410) Pins is a hightemperature heattransfer component: a seamless alloy steel base tube with 13% chromium martensitic stainless steel pins resistancewelded onto its surface. It is widely used in fired heaters, boilers, and high-temperature heat exchangers in refineries and power plants.
1. Base Tube:
ASTM A335 P22 seamless tube
(1) Chemical Composition (ASTM A335 P22, wt%)
| Element | Min | Max |
| Carbon (C) | 0.05 | 0.15 |
| Manganese (Mn) | 0.30 | 0.60 |
| Silicon (Si) | — | 0.50 |
| Phosphorus (P) | — | 0.025 |
| Sulfur (S) | — | 0.025 |
| Chromium (Cr) | 1.90 | 2.60 |
| Molybdenum (Mo) | 0.87 | 1.13 |
(2) Mechanical Properties (Room Temperature, ASTM A335)
| Property | Requirement |
| Tensile Strength | ≥ 415 MPa (60 ksi) |
| Yield Strength (0.2% offset) | ≥ 205 MPa (30 ksi) |
| Elongation (in 50 mm) | ≥ 30% |
| Hardness (Brinell) | ≤ 163 HB |
2. Fin Type: Studded (Pin) Fin Tube
Structure: Short cylindrical pins (studs) are resistancewelded in a dense pattern onto the outer surface of the base tube.
Purpose: Dramatically increases external surface area to boost heat transfer efficiency in gasside heat exchange
Fin Material:13Cr (SS410)
Composition: ~11.5–13.5% Cr, martensitic stainless steel.
Properties:
- Good high-temperature strength and oxidation resistance
- Moderate corrosion resistance in mild environments
- Hardenable via heat treatment.
Role: Provides durable, heatresistant fins that withstand fouling and high temperatures in process heaters.
3. Key Advantages of ASTM A335 P22 studded Fin Tube
- High thermal efficiency: Pin geometry maximizes heat transfer in gas streams.
- High temperature capability: P22 base tube handles up to ~600°C service.
- Mechanical robustness: Strong weld bonds resist vibration, thermal cycling, and fouling cleaning.
- Cost-effective: Combines hightemperature alloy tube with durable stainless steel fins.
In short, the ASTM A335 P22 studded tube with 13Cr pins represents a premium solution for aggressive heat transfer applications. Built to endure extreme temperatures and pressures, it ensures reliable, long-lasting service in essential petrochemical processes, such as furnace and reformer operations, as well as in power generation heat recovery systems.
The application of ASTM A335 P22 studded tube with 13Cr pins
| Industry | Core Application | Function & Benefit |
| Petrochemical & Oil Refining | Radiant sections of furnaces and heaters (e.g., distillation, coking, reforming, and ethylene cracking furnaces) . | Maximizes heat absorption from radiant flames in the most intense zone of the furnace. The studs protect the tube and enhance heat transfer. |
| Power Generation | Heat Recovery Steam Generators (HRSGs) and boiler systems. | Recovers heat from hot flue gas or exhaust to generate steam. The studs improve efficiency, even with dusty gases. |
| Chemical Processing | Heat exchangers and reactors handling corrosive media (e.g., fluidized bed reactors, waste heat recovery systems) . | Provides efficient and precise temperature control. The SS410 pins offer excellent resistance to external corrosion and wear, extending service life. |
| General Heat Exchange | Convection sections, air preheaters, and fired heaters . | Increases the heat exchange area by 2-3 times compared to a bare tube, boosting overall thermal efficiency and making it a key energy-saving component. |
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